I have a Nikon D80 and have some questions re the Opteka 500mm mirror lens.

1. Is this lens fully compatible with the Nikon d80 i.e. does it provide
full metering with aperture priority so that only the focus needs to be
adjusted manually?

2. Any comments on the quality of this lens and its suitability for the
Nikon D80 would be gratefully received. It is widely advertised at about
£60, is it a bargain or junk?

Malcolm